Worked on the microsoft/OpenAPI.NET repository to streamline the OpenAPI schema model by removing the unused UnEvaluatedProperties property from both IOpenApiSchema and its OpenApiSchemaReference implementation. This effort involved careful code refactoring in C# to simplify the API surface and reduce future maintenance. Updated related public API tests to reflect the new schema structure, ensuring continued regression coverage and stability. Addressed a duplicate property issue encountered during the cleanup process, further consolidating the schema definition. The changes improved downstream developer experience by making the API more predictable and maintainable, leveraging skills in API development, schema definition, and automated testing.